Abstract The thermal desorption of water and hydrogen from a rapidly solidified Al-Zn-Mg alloy powder was studied by means of temperature programmed desorption mass spectrometry (TPD-MS). By applying the Kissinger formalism, an activation energy of 137 ± 7 kJ/mol and a pre-exponential factor of 5.2 × 1011 s−1 were deduced for the primary broad water desorption peak, strongly conforming to the two pure phases of Al(OH)3, gibbsite and bayerite. Desorption of hydrogen is assigned to the oxidation of aluminum by water evolving during dehydration of the surface hydroxide layer upon heating. Overall, a complex mechanochemical mechanism is captured, with desorption profiles that are indicative of two types of oxidation processes: (1) fast, non-kinetic oxidation, initiated at ∼377 °C, followed by, (2) a slower, diffusion controlled oxidation event. The former may be viewed as a solid experimental evidence for the breakage of the surface oxide film, occurring at a relatively low temperature (

中文翻译：

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快速凝固的 Al-Zn-Mg 合金粉末中 H2O 和 H2 的热解吸动力学

摘要 采用程序升温脱附质谱(TPD-MS) 研究了快速凝固的Al-Zn-Mg 合金粉末对水和氢的热脱附。通过应用 Kissinger 公式，推导出初级宽解吸峰的活化能为 137 ± 7 kJ/mol 和指前因子为 5.2 × 1011 s-1，与 Al(OH )3、三水铝石和三羟铝石。氢的解吸归因于在加热时表面氢氧化物层脱水过程中放出的水对铝的氧化。总体而言，捕获了复杂的机械化学机制，解吸曲线表明两种类型的氧化过程：（1）快速、非动力学氧化，在~377°C 开始，然后是（2）较慢的、扩散控制的氧化事件。